Influence of design parameters of tundish and technological parameters of steel continuous casting on the hydrodynamics of the liquid steel flow

Hydrodynamic conditions occurring in the tundish are strictly connected with the equipment of its working zone. On such conditions influence also many factors such as: the amount of steel present in the working zone, the velocity of steel casting. In order to study these relationships the CFD simulation and physical modelling were applied. Research was carried out for the following parameters: different velocity of steel casting, bare tundish and tundish with turbulence inhibitor (kind of working zone equipment) and the amount of liquid steel in tundish equal 5,5 Mg and 7,5 Mg

Emergency condition of the operation of a non-symmetric tundish

The aim of the research was to analyze the influence of the flow behavior of liquid steel in a three-strand, asymmetric tundish when not all outlet openings are working. This problem was solved through physical modeling. The tests were carried out with the use of the water model of the continuous casting (CC) machine equipped with an asymmetrical, three-strand tundish model, made on a reducing scale. Modelling research concerned casting 110 x 110 mm square ingots. The obtained results of visualization tests and resistance time distribution (RTD) characteristics (F type) allowed to determine the method of mixing the steel (changes in mixing intensity were estimated) for the analyzed experimental variants

The process of dissolving solid lump carbonaceous fuel (SLCF) in the oxygen converter - physical modeling

The article presents the results of modeling research of hydrodynamic phenomena occurring in the oxygen converter during the addition of SLCF while blowing the liquid bath. The water physical model of the oxygen converter was used for the research. The oxygen lance of the model was equipped with a head with five nozzles at an angle to the lance axis. The research was aimed at determining the most favorable process parameters for the use of lump fuel in the oxygen converter

Modified froude criterion in modeling two-phase flows in a steel ladle

The dominant dynamic similarity criterion in the modelling of two-phase flows in steel metallurgy is the modified Froude (Fr) criterion. Modifications of this criterion, depending on the purpose of the research, may take various forms. The article presents the results of experiments carried out with the application of the steel ladle water model, with the use of various modifications of Froude criterion. The results obtained allow for the classification of the tested modifications from the perspective of the research objectives

Influence of casting rate on the mixing process of steel in non-symmetric tundish

The article presents the results of research aimed at determining the nature of changes in the mixing of liquid steel in asymmetrical tundish due to the increase in casting speed and the possibility of limiting the use of Flow Control Devices (FCD). The tests were carried out on the water model of the Continuous Steel Casting (CSC) device equipped with the tundish model. Four variants of casting speed were analyzed. The analysis of the obtained results was divided into two stages: qualitative analysis of flow and mixing (visualization process) and quantitative analysis of flow and mixing (by analysis of mixing curves - Residence Time Distribution (RTD) type F)

Mješanje i kemijska homogenizacija taline čelika u 100-tonskom livnom loncu

The article presents numerical simulations of fluid flow and chemical homogenization of liquid steel in gas-stirred ladle with two asymmetric porous plugs. In this study mixing time is analyzed as a function of porous plug location. All calculations were carried out by commercial computer program Fluent using k-ε turbulence model. Results show the velocity vectors of liquid steel and tracer concentration field after alloy addition. Numerical calculations were used to get the mixing time of liquid steel as a function of gas flow rate and porous plugs location.Članak predstavlja numeričke simulacije tijeka tekućine i kemijske homogenizacije tekućeg čelika u loncu s miješanjem plina pomoću asimetrično postavljenih poroznih čepova. U ovoj se studiji vrijeme miješanja analizira kao funkcija položaja poroznog čepa. Svi su izračuni provedeni pomoću komercijalnog računalskog programa Fluent koristeći k- ε modele turbulencije. Rezultati pokazuju vektore brzine tekućeg čelika i polje koncentracije obilježenih indikatora nakon dodavanja legure. Numerički su proračuni upotrijebljeni za dobivanje vremena miješanja tekućeg čelika kao funkcije brzine toka plina i položaja poroznog čep

Modified froude criterion in modeling two-phase flows in a steel ladle

The dominant dynamic similarity criterion in the modelling of two-phase flows in steel metallurgy is the modified Froude (Fr) criterion. Modifications of this criterion, depending on the purpose of the research, may take various forms. The article presents the results of experiments carried out with the application of the steel ladle water model, with the use of various modifications of Froude criterion. The results obtained allow for the classification of the tested modifications from the perspective of the research objectives

Influence of casting rate on the mixing process of steel in non-symmetric tundish

The article presents the results of research aimed at determining the nature of changes in the mixing of liquid steel in asymmetrical tundish due to the increase in casting speed and the possibility of limiting the use of Flow Control Devices (FCD). The tests were carried out on the water model of the Continuous Steel Casting (CSC) device equipped with the tundish model. Four variants of casting speed were analyzed. The analysis of the obtained results was divided into two stages: qualitative analysis of flow and mixing (visualization process) and quantitative analysis of flow and mixing (by analysis of mixing curves - Residence Time Distribution (RTD) type F)

Validation of numerical model of a liquid flow in a tundish by laboratory measurements

The article presents results of physical and numerical modelling of steel flow through a tundish of continuous casting machine. In numerical calculations the influence of mesh density was tested and the correctness of the flow description in the near-wall region was checked using Standard Wall Function model. Obtained results were verified using experimental results of velocity field (PIV method) coming from a water tundish model

Modelling of hydrodynamic phenomena occurring in refining ladles for high-carbon Fe-Si alloys

This paper presents the results of research conducted with the use of water physical model of refining ladle for production of high-carbon FeSi alloys. The purpose of the research was to determine the possibilities to enhance the efficiency of the production process by using combined gas injection into the bath. The research involved analysis of four variants of the experiment. Those variants varied in terms of the location of a purging plug fitted in the model bottom and the application of immersion lance to support the process. The research involved the analysis of changes in the hydrodynamic effects in the ladle model occurring as a result of the gas injection. The tests consisted in a qualitative analysis (process visualisation) in order to identify the movement of the modelling liquid and the mechanism of gas bubbles behaviour in the liquid